Angle converter

Claim 1

IN ANGLE CONVERTER APPARATUS OF THE CHARACTER DISCLOSED FOR USE IN A GUN FIRE CONTROL SYSTEM ABOARD A VESSEL, IN COMBINATION, MEANS FOR COMPUTING TWO SIGNALS REPRESENTATIVE OF THE LINEAR TRAVERSE RATE AND LINEAR ELEVATION RATE OF A MOVING TARGET RESPECTIVELY, ARTIFICIAL TARGET MEANS INCLUDING AN ARTIFICIAL TARGET ON SAID APPARATUS AND MOVING IN A MANNER SIMILAR TO THE MOVEMENT OF THE REAL TARGET, SAID ARTIFICIAL TARGET MEANS INCLUDING DUAL SIGNAL GENERATING MEANS FOR GENERATING TWO SIGNALS CORRESPONDING TO THE MOVEMENTS OF THE ARTIFICIAL TARGET IN A PAIR OF MUTUALLY PERPENDICULAR PLANES CORRESPONDING TO THE TRAVERSE AND ELEVATION PLANES OF THE REAL TARGET RESPECTIVELY, MEANS FOR COMPARING THE COMPUTED SIGNALS WITH THE GENERATED SIGNALS TO OBTAIN TWO DIFFERENCE SIGNALS, MEANS FOR UTILIZING THE DIFFERENCE SIGNALS FOR ALTERING THE GENERATED SIGNALS IN A MANNER WHICH TENDS TO MAINTAIN THE DIFFERENCE SIGNALS AT ZERO, AND MEANS OPERATIVELY CONNECTED TO SAID LAST NAMED MEANS FOR OBTAINING GUN POSITIONING ORDERS IN DECK TRAIN AND DECK ELEVATION.